From feldspar group, Amazonite presents perfect cleavages in both directions, forming 90° angles or close to such value, hardness around 6 and relative density between 2.55 and 2.76.
Santa Maria de Itabira, MG, Brazil.
Feldspars are the most abundant minerals in the crust, standing for more than 60% of earth´s surface.
Tableware and china glazed, glass and porcelain tile manufacturing. The purest amazonites change into beautiful gemstones as they undergo cutting. Photo credit: Andréa Ferreira
Source: MM Gerdau - Museu das Minas e do Metal -